<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 语义化 -->
     <div>头部1</div>
     <!-- 百度蜘蛛 -->
     <header>头部2</header>
     <article>
        <h1>5555</h1>
        <p>111</p>
        <p>22</p>
     </article>
     <main>
        主要内容
     </main>
     <footer>1111</footer>
</body>
</html>